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| author | Wilco Dijkstra <wdijkstr@arm.com> | 2016-09-28 11:06:41 +0000 |
|---|---|---|
| committer | Wilco Dijkstra <wilco@gcc.gnu.org> | 2016-09-28 11:06:41 +0000 |
| commit | 912d9ec300f1f1262b1ab09798304d0c99ff5778 (patch) | |
| tree | 3c170771d3f815d96a6d0ba133a16b9fe28bc717 /libjava/classpath/lib/java | |
| parent | 1b4be62ad3e153d2e4eda115698cbf33fca09781 (diff) | |
| download | gcc-912d9ec300f1f1262b1ab09798304d0c99ff5778.zip gcc-912d9ec300f1f1262b1ab09798304d0c99ff5778.tar.gz gcc-912d9ec300f1f1262b1ab09798304d0c99ff5778.tar.bz2 | |
Optimize strchr (s, 0) to s + strlen (s).
Optimize strchr (s, 0) to s + strlen (s). strchr (s, 0) appears a common
idiom for finding the end of a string, however it is not a very efficient
way of doing so. Strlen is a much simpler operation which is significantly
faster (eg. on x86 strlen is 50% faster for strings of 8 bytes and about
twice as fast as strchr on strings of 1KB).
gcc/
* gimple-fold.c (gimple_fold_builtin_strchr):
New function to optimize strchr (s, 0) to strlen.
(gimple_fold_builtin): Add BUILT_IN_STRCHR case.
testsuite/
* gcc.dg/strlenopt-20.c: Update test.
* gcc.dg/strlenopt-21.c: Likewise.
* gcc.dg/strlenopt-22.c: Likewise.
* gcc.dg/strlenopt-22g.c: Likewise.
* gcc.dg/strlenopt-26.c: Likewise.
* gcc.dg/strlenopt-5.c: Likewise.
* gcc.dg/strlenopt-7.c: Likewise.
* gcc.dg/strlenopt-9.c: Likewise.
From-SVN: r240568
Diffstat (limited to 'libjava/classpath/lib/java')
0 files changed, 0 insertions, 0 deletions